Research on Roof Cutting and Pressure Relief Technology of Deep Hole Pre-cracking Blasting

Jilong Qin; Peng Zhu

doi:10.54097/ty3bvn95

Authors

Jilong Qin
Peng Zhu

DOI:

https://doi.org/10.54097/ty3bvn95

Keywords:

Dynamic Pressure Gob-side Entry, Deep Hole Pre- cracking Blasting, Numerical Simulation, Parameter Optimization

Abstract

The dynamic pressure gob-side entry is affected by the whole mining process of the working face, and the cause of the large deformation is the additional stress generated during the rotary sinking process of the key block. Therefore, in order to alleviate the deformation of surrounding rock of roadway along goaf. The deep hole pre-splitting blasting roof cutting pressure relief method is used to relieve the pressure of the test roadway. In this study, finite element and discrete element models were established by means of numerical simulation and theoretical analysis, and the law of influence of cutting top height and Angle on roof cutting effect is studied. The optimal cutting height and angle are 15 m and 10° towards the gob, respectively. The industrial test results show that the deformation of surrounding rock of the test roadway is controlled within a reasonable range after pressure relief, and the roadway section meets the production demand.

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References

G.C. Zhang, C.W. Zang, M. Chen, et al. Ground response of entries driven adjacent to a retreating longwall panel, International Journal of Rock Mechanics and Mining Sciences, Vol. 138 (2021), 104630.

Q. L. Chang, S. G. Ge, X. Y. Shi, et al. Determination of narrow coal pillar width and roadway surrounding rock support technology in gob driving roadway, Sustainability, Vol. 14 (2022), No.8, 4848.

D.M. Zuev, D.D. Makarov, K.G. Okhotkin. Experimental and analytical study of geometric nonlinear bending of a cantilever beam under a transverse load, Journal of Applied Mechanics and Technical Physics, Vol. 63 (2022), p.365-371.

W. H. Zha, S. Hao, S. Liu, et al. Surrounding rock control of gob-side entry driving with narrow coal pillar and roadway side sealing technology in Yangliu Coal Mine, International Journal of Mining Science and Technology, Vol. 27 (2017), No.5, p.819-823.

F. L. He, X. H. Xu, B. B. Qin, et al. Study on deformation mechanism and control technology of surrounding rock during reuse of gob side entry retaining by roof pre-splitting, Engineering Failure Analysis, Vol. 137 (2022), 106271.

K. G. Fan, H. G. Liang, C. S. Ma, et al. Non-harmonious deformation controlling of gob-side entry in thin coal seam under dynamic pressure, Journal of Rock Mechanics and Geotechnical Engineering, Vol. 6 (2014), No.3, p.269-274.

J. Zhang, M. C. He, G. Yang, et al. N00 method with double-sided roof cutting for protecting roadways and surface strata, Rock Mechanics and Rock Engineering, Vol. 57 (2024), p.1629-1651.

M. Wang, Y. L. Xu, Q. Y. Xu, et al. Stability control of overburden and coal pillars in the gob-side entry under dynamic pressure, International Journal of Rock Mechanics and Mining Sciences, Vol. 170 (2023), 105490.

D. Y. Li, P. K. Chen, J. Z. Liu, et al. Risk field assessment of longwall working face by the double-sided roof cutting along the gob, Geohazard Mechanics, Vol. 1 (2023), No.4, p. 277-287.

Q. Zhang, M. C. He, S. Guo, et al. Investigation on the key techniques and application of the new-generation automatically formed roadway without coal pillars by roof cutting, International Journal of Rock Mechanics and Mining Sciences, Vol. 152 (2022), 105058.